<template>
  <el-container>
    <!-- 头部区域 -->
    <el-header>
        <div>
            <img src="../assets/home.jpg" alt="">
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <!-- 侧边栏菜单区域 -->
            <el-menu
                background-color="#333744"
                text-color="#fff"
                active-text-color="#409fff"
                unique-opened
                :collapse="isCollapse"
                :collapse-transition="false"
                router
                :default-active="activePath"
                >
                <!-- 这些属性详情可以看Element-ui的详细介绍 -->
                <!-- unique-opened 只打开一个二级目录 -->
                <!-- router 开启index属性作为路由功能 -->
                <!-- :default-active="$router.currentRoute.path" 也可以实现点击的链接高亮显示 -->
                <!-- 一级菜单 -->
                <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                    <!-- 一级菜单模板区 -->
                    <template slot="title">
                        <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文本 -->
                        <span>{{item.authName}}</span>
                    </template>
                    <!-- 二级菜单 -->
                    <el-menu-item :index="'/' + subItem.path + ''" v-for="subItem in item.children" :key="subItem.id" @click="saveActivePath('/' + subItem.path)">
                        <template slot="title">
                            <!-- 图标 -->
                            <i class="el-icon-menu"></i>
                            <!-- 文本 -->
                            <span>{{subItem.authName}}</span>
                        </template>
                    </el-menu-item>
                </el-submenu>
            </el-menu>
        </el-aside>
        <!-- 主要内容 -->
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
    </el-container>
    </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 激活的链接
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
  },
  methods: {
    logout () {
      window.sessionStorage.removeItem('token')
      this.$router.push('/login')
    },
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.menuList = res.data
    },
    // 点击按钮，奇幻菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveActivePath (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
      // this.activePath = this.$route.path
    }
  }
}
</script>

<style lang="less" scoped>
  .el-container {
    height: 100%;
  }
  .el-header {
    background-color: #373d41;
    color: #eee;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
        img {
            width: 50px;
            height: 50px;
            border-radius: 50%;
        }
    }
  }

  .el-aside {
    background-color: #333744;
    color: #eee;
    text-align: center;
    line-height: 200px;
    .el-menu {
        border-right: none;
    }
  }

  .el-main {
    background-color: #eaedf1;
    color: #333;
    text-align: center;
    line-height: 160px;
  }
  .iconfont {
    margin-right: 10px;
  }
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
